Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 5 - Trigonometric Functions - Chapter Test - Page 460: 14


$\approx 0.309$

Work Step by Step

We are asked to use a calculator to compute the result in radian mode and then round-off the result to three decimal places. We get: $\cos (\dfrac{2 \pi}{5})=0. 30901699437 \approx 0.309$
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